Underground electric cable



(No Model.)

B. WILLIAMS.

UNDERGROUND ELECTRIC) CABLE. No. 350,515. Patented 001;. 12, 1886.

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UNITED STAT S- BENEZETTE IVILLIAMS, OF CHICAGO, ILLINOIS.

UNDERGROUND ELECTRIC CABLE.

SPECIFICATION forming part of Letters Patent No. 350,515, dated October12, 1886.

Application filed December 2, 1885. Serial No. 184,508. (No model.)

I To all whom it may concern:

line a: of Fig. 1.

Be it known that I, Bnnnznrrn WILLIAMS, residing at Chicago, in thecounty of Cook and State of Illinois, and a citizen of the UnitedStates, have invented a new and useful I m provement in UndergroundElectric Conduits, of which the following is a full description,reference beinghad to the accompanying drawings, in which- Figure I is aside elevation. Fig. 21s aplan. Fig. 3 is an end view. Fig. 4. is asection at Fig. 5 is a vertical longitudinal section showing thecompleted joint between two sections of pipe. Fig. 6 shows a devicewhich I use while forming a joint for the purpose of preserving thecontinuity of the holes in the conduit.

Underground conduits for electric wires are made in sections fromasphalt concrete, the joints being completed by the use of. suchconcrete. It often happens that the joints as now made are imperfect.

The leading objects of my invention are to make more perfect joints inthe conduit, and at the same time secure the continuity of the passagesthrough the conduit, which I accomplish as illustrated in the drawings,and hereinafter described.

That which I claim as new will be specified in the claims.

In the drawings, A B represent two sections of a square condnit,whichare cutaway alittle at each end on the under side, to admit concretebetween the pipe and its support, as shown at u, Fig. 5.

a is a support on which the adjoining ends of two sections of pipe rest.

b are two pieces, oval or circular in form, one on each side of thepipe,l.ocated at a joint and resting on the support a, to which they aresecured at their lower ends by means of screws or other fasteniugs whichpass through,

f, to engage with the end of the pipe. 9 are books secured to C onopposite sides.

D are two pieces of .wood, to the upper edges of which are securedplates 71, which rest on r the pipe.

i are bearings secured to the blocks D.

j are crank-rods, which are supported in the bearings i.

k are rods in the ends of which the crankrods j are pivoted. Asshown,these rods 7c are made in two parts, and can be shortened orlengthened by means of a screw-sleeve, Z.

E are chains, one end of each. being connected with a link or arm, m,loosely connected with the crank-rod j. The other ends of the chains areconnected with the hooks g.

F is a device to be inserted one in each of the holes in the pipe whilethejoint is being formed. It is hollow and designed to be filled withwater. As shown, this device F consists of several pieces, one of whichis a tube, a, secured by a screw-thread to the piece 0, the outer endbeing closed by a pointed head, 19. Another tube, q, is secured to 0,and the outer end of q is closed by a cap, 0'.

s is a third piece of tube, secured also to 0, leaving a space, t,between q and. s.

In laying the conduit the two adjoining ends of two sections of pipe, AB, are to be placed on the block or support a, the ends of the pipebeing a little distance apart. The parts being in place are held by thestrap d. A device,F, is then to be inserted in each one of the holes inthe conduit, so that the parts will be at the joint. Then hot asphaltconcrete is to be poured into the opening between the two pieces ofpipe, and into the chamber around the same and over the top of thejoint. Such concrete will pass around the devices F. Before the hotconcrete has become cool the two adjoining ends of the pipe can bebrought some nearer together by means of the chains E. The strain uponthe cranks j will press the blocks D against the sides of the pipesufficiently to prevent them from slipping thereon. By thus bringing thetwo ends of the pipe a little nearer together and compressing theconcrete at the j oint,the sanie (having been poured while hot) willunite with the ends of the pipe anda perfect joint will be formed, thepipe being in effect continuous and without joints. When sufficientpressure has been applied, the de vices F can be partially drawn out,bringing the part a to the joint where it can be allowed PATENT OFFICE.v

to remain for a few moments, and this part being filled with water theconcrete will soon cool, when the devices F can be entirely withdrawn,leaving continuous passages. As shown in the drawings, there is a seriesof large holes for the main wires and one row of smaller holes. Coolerssimilar to the devices F can be inserted in the smaller holes while thejoint is being formed.

I have only shown two sections of pipe, but a number of sections may bearranged ready to have the joints completed at the same time, and byproviding a device, 0, at the end of the last section and by using oneset of clamping devices with sufficiently long chains, two or morejoints may be closed and completed at one operation, the parts F beingsuitably constructed or rods in place thereof.

In Fig. 2 I have shown one way of tightening the chains, and thuscompressing the cement at thejoint,which is as follows: The shank a ofthe hook g is hollow at one end and screwthreaded on the inside. Thisshank enters a socket, 0. dis a screw-bolt, which enters the shank a,the bolt being provided with a head adapted to receive a wrench. Byturning this bolt the chains may be tightened. I do not limit myself tothis specific way of ti htening the chains and compressing the cement atthe 30 joint.

An important feature of my invention consists in the method of coolingthe hot cement at the joints and forming continuous passages by means ofa tube or hollow rod containing or adapted to receive a cooling-fluid.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

1. A clamping device adapted to be applied to one section of a conduit,in combination with a device adapted to engage with one end of anothersection of a conduit,and connecting-chains, substantially as and for thepurpose specified.

2. A clamping device consisting of block D, combined with crank-rod 7',supported in bearings, and rods 7r, substantially as and for the purposespecified.

3. The blocks D, crank-rod j, and rods It, in combination with a device,0, adapted to engage with the end of a section of pipe,andconnecting-chains, substantially as and for the purposes specified.

4-. The method herein described of cooling hot cement at the joints ofelectric conduits and iorming continuous passages at such joints by theuse of a tube or hollow rod filled with or adapted to receive acooling-fluid, substantially as specified.

5. The hollow device F, adapted tohe filled with water, one part beingdouble, thus :l'ornr ing an air-space, i, substantial] y as and for thepurpose specified.

- BENEZETTE WILLIAMS.

lVitnesses:

ALBERT H. ADAMS, HARRY T. J oNns.

